Display screen or portion thereof having an icon



FIG. 1 is a first view of a display screen or portion thereof having an icon;

FIG. 2 is a second view of a display screen or portion thereof having an icon; and,

FIG. 3 is a third view of a display screen or portion thereof having an icon.

The broken lines (if any) are provided for illustrative purposes only to show environment and form no part of the claimed design. The claimed design is directed to one or more features of a display screen or portion thereof having an icon. Further, the portions of the display that are not shown in the drawings do not form any part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof having an icon, as shown and described. 